At present, the solar terms have already passed, and snowfall is possible at any time. How to manage the greenhouse vegetable before, during and after the snow is particularly important.
I. Pre-winter greenhouse vegetable management measures
1. When it is cloudy before the snow, it is necessary to uncover the grasshopper and absorb precious scattered light.
2. The application of organic fertilizer before snow can increase the heat capacity of the soil, buffer the cooling brought about by the loss of heat in cloudy days, and can also promote the root system to improve cold resistance.
3. Moderate control of water before snow is very important to reduce the relative humidity of the air in the shed. At the same time, it can create an environment where the bottom is damp and the topsoil is dry.
Second, snow in the greenhouse vegetable management measures
1. When it is snowing, it should be well covered with grasshoppers, cover the greenhouse in time with a cold-proof film, use a grasshopper on the front of the greenhouse to block a layer of cold-proof skirts, and tightly close the buffer chamber door to prevent cold wind from entering.
2. Photosynthesis of vegetables is very weak when snowing, and there are few photosynthetic products synthesized. In order to reduce respiratory consumption, the temperature of night greenhouses should be 2°C-3°C lower than the nighttime of sunny days.
3. In the case of continuous snowfall, the respiratory consumption of vegetables is greater than photosynthesis, and large amounts of harmful gases such as carbon dioxide are accumulated in greenhouses. Therefore, for more than three days in continuous snowfall, snow should be released for 1 hour at noon.
Third, the greenhouse after the snow vegetable management measures
1. The snow on the shed film should be cleared in time after snow to increase the transparency and the amount of light; as long as the temperature does not cause a sharp drop in the temperature of the shed after the exposing, it should be revealed every day.
2. When the sun comes out, if the leaves appear wilting, some grasshoppers should be put down and shading, and they can be placed one at a time. (The shanty who uses the roller blinds can roll the grasshopper to the middle of the shed first, instead of pulling it all open once). After the restoration, the draft is drafted. If the wilt reappears, the grasshopper can be put down again. This way, it can be repeated 2-3 times and the general wilt can be restored.
3. If a disease has occurred in the greenhouse, conventional spraying will not only increase the humidity in the greenhouse, but also increase the severity of the disease. It can be controlled by the use of aerosols and dust agents such as chlorothalonil and sulfamethoxazole to facilitate uniform application and avoidance. The air humidity in the shed is too high.
4. In order to prevent vegetables from freezing, it is necessary to loosen the soil in time and apply the available fertilizer in appropriate amounts. 0.2% potassium dihydrogen phosphate plus 0.3% calcium nitrate plus 1% glucose can be used to enhance plant resistance; As a result, more plants were harvested in time, and sparse fruit was used to reduce nutrient consumption.
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